My husband has been taking ambien and trazadone for years to help him sleep. He recently came off celexa for depression/anxiety and was put on viibryd. They started him out on 10mg, then 20, now 40. While taking the 10 and 20mg it seemed to be doing ok, no side effects. Since he started 40mg he has been having blurred vision, extremely tired at times, sweating, some nausea. I also did some research and found out that you are not suppose to mix trazadone and viibryd together. Are these side effects due to the drug interaction between the two or uping the dosage to 40mg? Should he come off one of the two medications? which one?